+extern void rsa_free(rsa_t *rsa);
+extern rsa_t *rsa_set_hex_public_key(char *n, char *e) __attribute__ ((__malloc__));
+extern rsa_t *rsa_set_hex_private_key(char *n, char *e, char *d) __attribute__ ((__malloc__));
+extern rsa_t *rsa_read_pem_public_key(FILE *fp) __attribute__ ((__malloc__));
+extern rsa_t *rsa_read_pem_private_key(FILE *fp) __attribute__ ((__malloc__));
+extern size_t rsa_size(rsa_t *rsa);
+extern bool rsa_public_encrypt(rsa_t *rsa, void *in, size_t len, void *out) __attribute__ ((__warn_unused_result__));
+extern bool rsa_private_decrypt(rsa_t *rsa, void *in, size_t len, void *out) __attribute__ ((__warn_unused_result__));